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import java.awt.AWTException;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.SystemTray;
import java.awt.TrayIcon;
import java.awt.image.BufferedImage;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

import jdk.test.lib.Platform;

/*
 * @test
 * @bug 6299866 8316931
 * @summary Tests that no NPE is thrown when the tray icon is disposed from the
 * handler of action event caused by clicking on this icon.
 * @library /java/awt/regtesthelpers /test/lib
 * @build PassFailJFrame jtreg.SkippedException
 * @run main/manual DisposeInActionEventTest
 */

public class DisposeInActionEventTest {
    private static SystemTray systemTray;
    private static TrayIcon trayIcon;

    public static void main(String[] args) throws Exception {
        if (!SystemTray.isSupported()) {
            throw new jtreg.SkippedException("The test cannot be run because " +
                    "SystemTray is not supported.");
        }
        String clickInstruction =
                (Platform.isOSX()) ? "Right-click" : "Double click (left mouse button)";

        String instructions = "When the test starts, it adds an icon to the tray area.\n" +
                       "The icon is a red filled square with a white border.\n" +
                       "If you don't see this tray icon, please make sure that the tray area\n" +
                       "(also called Taskbar Status Area on MS Windows, Notification\n" +
                       "Area on Gnome or System Tray on KDE) is visible.\n" +
                       "On macOS the default location is the right of the top system bar.\n\n" +
                       clickInstruction + " the tray icon to trigger the action event.\n" +
                       "Brief information about action events is printed\n" +
                       "in the Event Message Display frame.\n" +
                       "After each action event, the tray icon is removed from\n" +
                       "the tray and then added back in a second.\n\n" +
                       "The test checks if any exceptions are thrown when removing and\n" +
                       "re-adding the icon. If something is wrong, the test will automatically fail.\n" +
                       "Repeat clicks several times. Then press PASS button.";

        try {
            PassFailJFrame.builder()
                    .title("DisposeInActionEventTest")
                    .instructions(instructions)
                    .rows(18)
                    .columns(45)
                    .testUI(DisposeInActionEventTest::showFrameAndIcon)
                    .build()
                    .awaitAndCheck();
        } finally {
            if (systemTray != null) {
                systemTray.remove(trayIcon);
            }
        }
    }

    private static JFrame showFrameAndIcon() {
        JFrame frame = new JFrame("Event Message Display");
        frame.setLayout(new BorderLayout());

        JTextArea textArea = new JTextArea();
        frame.getContentPane().add(new JScrollPane(textArea));
        frame.setSize(400, 200);

        BufferedImage img = new BufferedImage(32, 32, BufferedImage.TYPE_INT_ARGB);
        Graphics g = img.createGraphics();
        g.setColor(Color.WHITE);
        g.fillRect(0, 0, 32, 32);
        g.setColor(Color.RED);
        g.fillRect(6, 6, 20, 20);
        g.dispose();

        systemTray = SystemTray.getSystemTray();
        trayIcon = new TrayIcon(img);
        trayIcon.setImageAutoSize(true);
        trayIcon.addActionListener(ev -> {
            textArea.append(ev + "\n");
            systemTray.remove(trayIcon);
            new Thread(() -> {
                try {
                    Thread.sleep(1000);
                    systemTray.add(trayIcon);
                } catch (AWTException | InterruptedException e) {
                    e.printStackTrace();
                    PassFailJFrame.forceFail("Exception caught: " + e.getMessage());
                }
            }).start();
        });

        try {
            systemTray.add(trayIcon);
        } catch (AWTException e) {
            e.printStackTrace();
            PassFailJFrame.forceFail("Exception caught: " + e.getMessage());
        }

        return frame;
    }
}